#include "includes.h"
#include "session.h"
#include "dbutil.h"
#include "packet.h"
#include "algo.h"
#include "buffer.h"
#include "dss.h"
#include "ssh.h"
#include "dbrandom.h"
#include "kex.h"
#include "channel.h"
#include "chansession.h"
#include "atomicio.h"
#include "tcpfwd.h"
#include "service.h"
#include "auth.h"
#include "runopts.h"
#include "crypto_desc.h"
static
void
svr_remoteclosed();
struct
serversession svr_ses;
static
const
packettype svr_packettypes[] = {
{SSH_MSG_CHANNEL_DATA, recv_msg_channel_data},
{SSH_MSG_CHANNEL_WINDOW_ADJUST, recv_msg_channel_window_adjust},
{SSH_MSG_USERAUTH_REQUEST, recv_msg_userauth_request},
{SSH_MSG_SERVICE_REQUEST, recv_msg_service_request},
{SSH_MSG_KEXINIT, recv_msg_kexinit},
{SSH_MSG_KEXDH_INIT, recv_msg_kexdh_init},
{SSH_MSG_NEWKEYS, recv_msg_newkeys},
{SSH_MSG_GLOBAL_REQUEST, recv_msg_global_request_remotetcp},
{SSH_MSG_CHANNEL_REQUEST, recv_msg_channel_request},
{SSH_MSG_CHANNEL_OPEN, recv_msg_channel_open},
{SSH_MSG_CHANNEL_EOF, recv_msg_channel_eof},
{SSH_MSG_CHANNEL_CLOSE, recv_msg_channel_close},
{SSH_MSG_CHANNEL_SUCCESS, ignore_recv_response},
{SSH_MSG_CHANNEL_FAILURE, ignore_recv_response},
{SSH_MSG_REQUEST_FAILURE, ignore_recv_response},
{SSH_MSG_REQUEST_SUCCESS, ignore_recv_response},
#ifdef USING_LISTENERS
{SSH_MSG_CHANNEL_OPEN_CONFIRMATION, recv_msg_channel_open_confirmation},
{SSH_MSG_CHANNEL_OPEN_FAILURE, recv_msg_channel_open_failure},
#endif
{0, 0}
};
static
const
struct
ChanType *svr_chantypes[] = {
&svrchansess,
#ifdef ENABLE_SVR_LOCALTCPFWD
&svr_chan_tcpdirect,
#endif
NULL
};
static
void
svr_session_cleanup(
void
)
{
svr_pubkey_options_cleanup();
}
static
void
svr_sessionloop() {
if
(svr_ses.connect_time != 0
&& monotonic_now() - svr_ses.connect_time >= AUTH_TIMEOUT) {
dropbear_close(
"Timeout before auth"
);
}
}
void
svr_session(
int
sock,
int
childpipe) {
char
*host, *port;
size_t
len;
common_session_init(sock, sock);
svr_ses.connect_time = monotonic_now();;
svr_ses.childpipe = childpipe;
#ifdef USE_VFORK
svr_ses.server_pid = getpid();
#endif
svr_authinitialise();
chaninitialise(svr_chantypes);
svr_chansessinitialise();
get_socket_address(ses.sock_in, NULL, NULL, &host, &port, 0);
len =
strlen
(host) +
strlen
(port) + 2;
svr_ses.addrstring = m_malloc(len);
snprintf(svr_ses.addrstring, len,
"%s:%s"
, host, port);
m_free(host);
m_free(port);
get_socket_address(ses.sock_in, NULL, NULL,
&svr_ses.remotehost, NULL, 1);
ses.remoteclosed = svr_remoteclosed;
ses.extra_session_cleanup = svr_session_cleanup;
ses.packettypes = svr_packettypes;
ses.isserver = 1;
sessinitdone = 1;
send_session_identification();
send_msg_kexinit();
session_loop(svr_sessionloop);
}
void
svr_dropbear_exit(
int
exitcode,
const
char
* format,
va_list
param) {
char
fmtbuf[300];
if
(!sessinitdone) {
snprintf(fmtbuf,
sizeof
(fmtbuf),
"Early exit: %s"
, format);
}
else
if
(ses.authstate.authdone) {
snprintf(fmtbuf,
sizeof
(fmtbuf),
"Exit (%s): %s"
,
ses.authstate.pw_name, format);
}
else
if
(ses.authstate.pw_name) {
snprintf(fmtbuf,
sizeof
(fmtbuf),
"Exit before auth (user '%s', %d fails): %s"
,
ses.authstate.pw_name, ses.authstate.failcount, format);
}
else
{
snprintf(fmtbuf,
sizeof
(fmtbuf),
"Exit before auth: %s"
, format);
}
_dropbear_log(LOG_INFO, fmtbuf, param);
#ifdef USE_VFORK
if
(svr_ses.server_pid == getpid())
#endif
{
session_cleanup();
}
exit
(exitcode);
}
void
svr_dropbear_log(
int
priority,
const
char
* format,
va_list
param) {
char
printbuf[1024];
char
datestr[20];
time_t
timesec;
int
havetrace = 0;
vsnprintf(printbuf,
sizeof
(printbuf), format, param);
#ifndef DISABLE_SYSLOG
if
(svr_opts.usingsyslog) {
syslog(priority,
"%s"
, printbuf);
}
#endif
#ifdef DEBUG_TRACE
havetrace = debug_trace;
#endif
if
(!svr_opts.usingsyslog || havetrace)
{
struct
tm
* local_tm = NULL;
timesec =
time
(NULL);
local_tm =
localtime
(×ec);
if
(local_tm == NULL
||
strftime
(datestr,
sizeof
(datestr),
"%b %d %H:%M:%S"
,
local_tm) == 0)
{
snprintf(datestr,
sizeof
(datestr),
"%d"
, (
int
)timesec);
}
fprintf
(stderr,
"[%d] %s %s\n"
, getpid(), datestr, printbuf);
}
}
static
void
svr_remoteclosed() {
m_close(ses.sock_in);
m_close(ses.sock_out);
ses.sock_in = -1;
ses.sock_out = -1;
dropbear_close(
"Exited normally"
);
}